feat(mining-app): 贡献值730天失效倒计时功能

将贡献值页面的"贡献值失效倒计时"从硬编码静态文字改为基于用户
首次挖矿时间的真实730天倒计时。纯新增方式实现，不影响现有功能。

后端 (mining-service):
- get-mining-account.query.ts: MiningAccountDto 新增 firstMiningDate
  字段，在 Promise.all 中并行查询用户最早的 miningRecord，利用
  @@unique([accountSequence, miningMinute]) 索引高效查询

前端实体/模型:
- share_account.dart: 新增 DateTime? firstMiningDate（可空，向后兼容）
- share_account_model.dart: fromJson/toJson 解析和序列化 firstMiningDate

前端 UI (contribution_page.dart):
- watch shareAccountProvider 获取首次挖矿时间
- 计算已过天数和剩余天数（730 - 已过天数）
- 进度条显示实际已用时间占比
- 显示具体失效日期和剩余天数
- 无挖矿记录 → 显示"暂无挖矿记录"
- 已过期 → 显示"贡献值已失效"
- 剩余 ≤30 天 → 进度条和文字变红色警告

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/services/mining-service/src/application/queries/get-mining-account.query.ts

@@ -12,6 +12,7 @@ export interface MiningAccountDto {
   totalContribution: string;
   perSecondEarning: string;  // 每秒收益 = (用户贡献 / 全网贡献) × 每秒分配量
   lastSyncedAt: Date | null;
+  firstMiningDate: Date | null;  // 首次挖矿时间（用于730天倒计时）
 }
 
 export interface MiningRecordDto {
@@ -53,12 +54,20 @@ export class GetMiningAccountQuery {
     // 计算每秒收益 = (用户贡献 / 全网贡献) × 每秒分配量
     // 只有在挖矿系统激活时才返回非零值
     let perSecondEarning = '0';
+    let firstMiningDate: Date | null = null;
     try {
-      const [config, totalContribution] = await Promise.all([
+      const [config, totalContribution, firstRecord] = await Promise.all([
         this.configRepository.getConfig(),
         this.accountRepository.getTotalContribution(),
+        this.prisma.miningRecord.findFirst({
+          where: { accountSequence },
+          orderBy: { miningMinute: 'asc' },
+          select: { miningMinute: true },
+        }),
       ]);
 
+      firstMiningDate = firstRecord?.miningMinute ?? null;
+
       // 检查挖矿系统是否激活
       if (config && config.isActive && totalContribution.value.toNumber() > 0) {
         const userContribution = account.totalContribution.value.toNumber();
@@ -79,6 +88,7 @@ export class GetMiningAccountQuery {
       totalContribution: account.totalContribution.toString(),
       perSecondEarning,
       lastSyncedAt: account.lastSyncedAt,
+      firstMiningDate,
     };
   }
 

frontend/mining-app/lib/data/models/share_account_model.dart

@@ -9,6 +9,7 @@ class ShareAccountModel extends ShareAccount {
     required super.totalMined,
     required super.perSecondEarning,
     required super.effectiveContribution,
+    super.firstMiningDate,
   });
 
   factory ShareAccountModel.fromJson(Map<String, dynamic> json) {
@@ -23,6 +24,9 @@ class ShareAccountModel extends ShareAccount {
       perSecondEarning: json['perSecondEarning']?.toString() ?? '0',
       // 后端返回 totalContribution，映射到 effectiveContribution
       effectiveContribution: json['totalContribution']?.toString() ?? json['effectiveContribution']?.toString() ?? '0',
+      firstMiningDate: json['firstMiningDate'] != null
+          ? DateTime.tryParse(json['firstMiningDate'].toString())
+          : null,
     );
   }
 
@@ -35,6 +39,7 @@ class ShareAccountModel extends ShareAccount {
       'totalMined': totalMined,
       'perSecondEarning': perSecondEarning,
       'effectiveContribution': effectiveContribution,
+      'firstMiningDate': firstMiningDate?.toIso8601String(),
     };
   }
 }

frontend/mining-app/lib/domain/entities/share_account.dart

@@ -8,6 +8,7 @@ class ShareAccount extends Equatable {
   final String totalMined;
   final String perSecondEarning;
   final String effectiveContribution;
+  final DateTime? firstMiningDate;
 
   const ShareAccount({
     required this.accountSequence,
@@ -17,6 +18,7 @@ class ShareAccount extends Equatable {
     required this.totalMined,
     required this.perSecondEarning,
     required this.effectiveContribution,
+    this.firstMiningDate,
   });
 
   String get totalBalance {
@@ -35,5 +37,6 @@ class ShareAccount extends Equatable {
         totalMined,
         perSecondEarning,
         effectiveContribution,
+        firstMiningDate,
       ];
 }

frontend/mining-app/lib/presentation/pages/contribution/contribution_page.dart

@@ -5,8 +5,10 @@ import '../../../core/constants/app_colors.dart';
 import '../../../core/router/routes.dart';
 import '../../../core/utils/format_utils.dart';
 import '../../../domain/entities/contribution.dart';
+import '../../../domain/entities/share_account.dart';
 import '../../providers/user_providers.dart';
 import '../../providers/contribution_providers.dart';
+import '../../providers/mining_providers.dart';
 import '../../widgets/shimmer_loading.dart';
 
 class ContributionPage extends ConsumerWidget {
@@ -25,6 +27,8 @@ class ContributionPage extends ConsumerWidget {
     final estimatedEarnings = ref.watch(estimatedEarningsProvider(accountSequence));
     // 获取积分股池余量
     final sharePoolAsync = ref.watch(sharePoolBalanceProvider);
+    // 获取挖矿账户信息（含首次挖矿时间，用于730天倒计时）
+    final shareAccountAsync = ref.watch(shareAccountProvider(accountSequence));
 
     // Extract loading state and data from AsyncValue
     final isLoading = contributionAsync.isLoading;
@@ -42,6 +46,7 @@ class ContributionPage extends ConsumerWidget {
           onRefresh: () async {
             ref.invalidate(contributionProvider(accountSequence));
             ref.invalidate(sharePoolBalanceProvider);
+            ref.invalidate(shareAccountProvider(accountSequence));
           },
           child: hasError && contribution == null
               ? Center(
@@ -84,7 +89,7 @@ class ContributionPage extends ConsumerWidget {
                           _buildTeamStatsCard(context, contribution, isLoading),
                           const SizedBox(height: 16),
                           // 贡献值失效倒计时
-                          _buildExpirationCard(context, contribution, isLoading),
+                          _buildExpirationCard(context, contribution, isLoading, shareAccountAsync.valueOrNull),
                           const SizedBox(height: 24),
                         ]),
                       ),
@@ -648,19 +653,42 @@ class ContributionPage extends ConsumerWidget {
     BuildContext context,
     Contribution? contribution,
     bool isLoading,
+    ShareAccount? shareAccount,
   ) {
     final isDark = AppColors.isDark(context);
-    // 贡献值有效期为2年（730天）
-    // 暂时使用固定信息，后续可从后端获取最近过期日期
     const int validityDays = 730;
-    final hasContribution = contribution != null &&
-        (double.tryParse(contribution.totalContribution) ?? 0) > 0;
 
-    // 如果有贡献值，显示有效期提示
-    final String expireDateText = hasContribution
-        ? '贡献值自生效日起 $validityDays 天内有效'
-        : '暂无贡献值';
-    final double progress = hasContribution ? 1.0 : 0.0;
+    // 从首次挖矿时间计算真实倒计时
+    final DateTime? firstMiningDate = shareAccount?.firstMiningDate;
+
+    int daysElapsed = 0;
+    int daysRemaining = validityDays;
+    double progress = 0.0;
+    String expireDateText;
+    String countdownText;
+
+    if (firstMiningDate == null) {
+      expireDateText = '暂无挖矿记录';
+      countdownText = '';
+    } else {
+      daysElapsed = DateTime.now().difference(firstMiningDate).inDays;
+      daysRemaining = (validityDays - daysElapsed).clamp(0, validityDays);
+      progress = (daysElapsed / validityDays).clamp(0.0, 1.0);
+
+      if (daysRemaining <= 0) {
+        expireDateText = '贡献值已失效';
+        countdownText = '已超过 $validityDays 天有效期';
+      } else {
+        final expirationDate = firstMiningDate.add(const Duration(days: validityDays));
+        final expirationStr =
+            '${expirationDate.year}-${expirationDate.month.toString().padLeft(2, '0')}-${expirationDate.day.toString().padLeft(2, '0')}';
+        expireDateText = '贡献值将于 $expirationStr 失效';
+        countdownText = '剩余 $daysRemaining 天';
+      }
+    }
+
+    final bool isUrgent = firstMiningDate != null && daysRemaining <= 30 && daysRemaining > 0;
+    final Color activeColor = isUrgent ? Colors.red : _orange;
     final bgGrayColor = isDark ? AppColors.backgroundOf(context) : const Color(0xFFF3F4F6);
 
     return Container(
@@ -684,7 +712,7 @@ class ContributionPage extends ConsumerWidget {
             ],
           ),
           const SizedBox(height: 12),
-          // 进度条
+          // 进度条（已用时间占比）
           ClipRRect(
             borderRadius: BorderRadius.circular(5),
             child: LinearProgressIndicator(
@@ -692,7 +720,7 @@ class ContributionPage extends ConsumerWidget {
               minHeight: 10,
               backgroundColor: bgGrayColor,
               valueColor: AlwaysStoppedAnimation<Color>(
-                isLoading ? bgGrayColor : _orange,
+                isLoading ? bgGrayColor : activeColor,
               ),
             ),
           ),
@@ -707,16 +735,18 @@ class ContributionPage extends ConsumerWidget {
                   expireDateText,
                   style: TextStyle(fontSize: 12, color: AppColors.textSecondaryOf(context)),
                 ),
-          const SizedBox(height: 4),
-          isLoading
-              ? const ShimmerText(
-                  placeholder: '有效期 --- 天',
-                  style: TextStyle(fontSize: 12, color: _orange, fontWeight: FontWeight.w500),
-                )
-              : const Text(
-                  '有效期 $validityDays 天',
-                  style: TextStyle(fontSize: 12, color: _orange, fontWeight: FontWeight.w500),
-                ),
+          if (countdownText.isNotEmpty) ...[
+            const SizedBox(height: 4),
+            isLoading
+                ? const ShimmerText(
+                    placeholder: '剩余 --- 天',
+                    style: TextStyle(fontSize: 12, color: _orange, fontWeight: FontWeight.w500),
+                  )
+                : Text(
+                    countdownText,
+                    style: TextStyle(fontSize: 12, color: activeColor, fontWeight: FontWeight.w500),
+                  ),
+          ],
         ],
       ),
     );